package top.shiyiri.java;

import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * @author Aunean
 * @date 2022/1/10
 */
/*
实现TCP的网络编程
例子一：客户端发送信息给服务端，服务端将信息显示在控制台上
 */
public class TCPTest1 {

    //客户端
    @Test
    public void client() {
        Socket socket = null;
        OutputStream os = null;
        try {
            //1.创建 Socket 对象，指明服务器端的IP和端口号
            InetAddress inet = InetAddress.getByName("127.0.0.1");
            socket = new Socket(inet, 8989);
            //2.获取一个输出流，用于输出数据
            os = socket.getOutputStream();
            //3.写出数据的操作
            os.write("你好，我是客户端".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //4.关闭资源
            try {
                assert os != null;
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    //服务端
    @Test
    public void server() {
        Socket accept = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        try {
            //1.创建服务器端的ServerSocket，指明字节的端口号
            ServerSocket socket = new ServerSocket(8989);
            //2.调用 accept() 表示接收来自客户端的socket
            accept = socket.accept();
            //3.获取输入流
            is = accept.getInputStream();

            //不建议这样写，可能会有乱码
/*            byte[] buffer = new byte[1024];
            int len;
            while ((len = is.read(buffer)) != -1) {
                String str = new String(buffer, 0, len);
                System.out.println(str);
            }*/
            //4.读取流中的数据
            baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[5];
            int len;
            while ((len = is.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
            }
            System.out.println(baos.toString());
            System.out.println("收到了来自于：" + socket.getInetAddress().getHostName() + "的信息");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //5.释放资源
            try {
                assert baos != null;
                baos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                accept.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
